package com.atguigu.yjh.product.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.yjh.common.utils.PageUtils;
import com.atguigu.yjh.common.utils.Query;
import com.atguigu.yjh.product.service.CategoryBrandRelationService;
import com.atguigu.yjh.product.vo.Catelog2Vo;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.Caching;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.yjh.product.dao.CategoryDao;
import com.atguigu.yjh.product.entity.CategoryEntity;
import com.atguigu.yjh.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    RedissonClient redisson;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
//        查出来所有的分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

//        组装成父子的树形结构
//        找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort() ==null?0:menu1.getSort()) - (menu2.getSort() ==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;


    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
//        批量删除之前先检查
        baseMapper.deleteBatchIds(asList);
    }

    //[2,25,225]
    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);

        Collections.reverse(parentPath);


        return parentPath.toArray(new Long[parentPath.size()]);
    }
// 级联更新所有关联的数据

    /**
     * CacheEvict:失效模式
     * @param category
     */
//    @CacheEvict(value = "category",key = "'getLevel1Categorys'")
//    @Caching(evict = {
//            @CacheEvict(value = "category",key = "'getLevel1Categorys'"),
//            @CacheEvict(value = "category",key = "'getCatalogJson'")
//    })
    @CacheEvict(value = "category",allEntries = true)
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }



    //225,25,2
    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        //1、收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;

    }

//    递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort() ==null?0:menu1.getSort()) - (menu2.getSort() ==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

//--------------------------web-------------------------------------------


    @Cacheable(value = {"category"},key = "#root.method.name",sync = true)
    @Override
    public List<CategoryEntity> getLevel1Categorys() {

        long l = System.currentTimeMillis();
        List<CategoryEntity> categoryEntities = baseMapper.selectList(new QueryWrapper<CategoryEntity>().eq("parent_cid", 0));
        return categoryEntities;
    }

    @Cacheable(value = "category",key = "#root.methodName")
    @Override
    public Map<String, List<Catelog2Vo>> getCatalogJson(){
        List<CategoryEntity> selectList = baseMapper.selectList(null);
        List<CategoryEntity> level1Categorys = getParent_cid(selectList,0L);

        Map<String, List<Catelog2Vo>> parent_cid = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            List<CategoryEntity> categoryEntities = getParent_cid(selectList,v.getCatId());
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                    List<CategoryEntity> level3Catelog =getParent_cid(selectList,l2.getCatId());
                    if(level3Catelog!=null){
                        List<Catelog2Vo.Catelog3Vo> collect = level3Catelog.stream().map(l3 -> {
                            Catelog2Vo.Catelog3Vo catelog3Vo = new Catelog2Vo.Catelog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());
                            return catelog3Vo;

                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(collect);
                    }
                    return catelog2Vo;
                }).collect(Collectors.toList());

            }
            return catelog2Vos;

        }));
        return parent_cid;
    }

    //TODO产生堆外内存溢出
//    @Override
    /**
     * 1.空结果缓存，解决缓存穿透
     * 2.设置过期时间（加设计师）：解决1缓存雪崩
     * 3.加锁：解决缓存击穿
     */
    public Map<String, List<Catelog2Vo>> getCatalogJson2() {
//        加入缓存逻辑,缓存中存的的json字符串
//        json跨平台，跨语言
//        System.out.println("================");
        String catalogJSON = redisTemplate.opsForValue().get("catalogJSON");
//        System.out.println(!StringUtils.isEmpty(catalogJSON));
        if(StringUtils.isEmpty(catalogJSON)){

            Map<String,List<Catelog2Vo>> catalogJsonFromDb = getCatalogJsonFromDbWithRedissonLock();
//            System.out.println(catalogJsonFromDb);
            System.out.println("去redis中拿数据");


            return catalogJsonFromDb;
        }
        Map<String,List<Catelog2Vo>> result = JSON.parseObject(catalogJSON,new TypeReference<Map<String, List<Catelog2Vo>>>(){});

        return result;

    }


    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithRedissonLock() {
//锁的名字，锁的粒度，越细越快

        RLock lock = redisson.getLock("CatalogJson-lock");
        lock.lock();

            Map<String,List<Catelog2Vo>> dataFromDb;
            try{
                dataFromDb = getDataFromDb();
            }finally {
                lock.unlock();
            }
            return dataFromDb;
    }

    //从数据库查询并封装分类数据
    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithRedisLock() {

        /**
         * 将数据库的多次变为一次
         *
         */

//        占位分布式锁
        String uuid = UUID.randomUUID().toString();
        Boolean lock = redisTemplate.opsForValue().setIfAbsent("lock", uuid,300, TimeUnit.SECONDS);
        if(lock){
            System.out.println("获取分布式锁成功");
//            加锁成功
//            设置过期时间和加锁同步
//            redisTemplate.expire("lock",30, TimeUnit.SECONDS);
            Map<String,List<Catelog2Vo>> dataFromDb;
            try{
                System.out.println("查询数据库=========================");
                 dataFromDb = getDataFromDb();
            }finally {
                System.out.println("原子");
                String script="if redis.call('get',KEYS[1]) == ARGV[1] then return redis.call('del',KEYS[1]) else return 0 end";
                Long lock1 = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class)
                        , Arrays.asList("lock"), uuid);

            }


//            redisTemplate.delete("lock");
//            String lockValue = redisTemplate.opsForValue().get("lock");
//            if(uuid.equals(lockValue)){
//                redisTemplate.delete("lock");
//            }
//            原子删锁

            return dataFromDb;

        }else {
            System.out.println("获取分布式锁失败");
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {

            }
//            加锁失败（重试）
            return getCatalogJsonFromDbWithLocalLock();

        }




    }

    private Map<String, List<Catelog2Vo>> getDataFromDb() {
        String catalogJSON = redisTemplate.opsForValue().get("catalogJSON");
        if(!StringUtils.isEmpty(catalogJSON)){
            Map<String,List<Catelog2Vo>> result = JSON.parseObject(catalogJSON,new TypeReference<Map<String, List<Catelog2Vo>>>(){});

            return result;
        }


        List<CategoryEntity> selectList = baseMapper.selectList(null);

        List<CategoryEntity> level1Categorys = getParent_cid(selectList,0L);

        Map<String, List<Catelog2Vo>> parent_cid = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
            List<CategoryEntity> categoryEntities = getParent_cid(selectList,v.getCatId());
            List<Catelog2Vo> catelog2Vos = null;
            if (categoryEntities != null) {
                catelog2Vos = categoryEntities.stream().map(l2 -> {
                    Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                    List<CategoryEntity> level3Catelog =getParent_cid(selectList,l2.getCatId());
                    if(level3Catelog!=null){
                        List<Catelog2Vo.Catelog3Vo> collect = level3Catelog.stream().map(l3 -> {
                            Catelog2Vo.Catelog3Vo catelog3Vo = new Catelog2Vo.Catelog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());
                            return catelog3Vo;

                        }).collect(Collectors.toList());
                        catelog2Vo.setCatalog3List(collect);
                    }
                    return catelog2Vo;
                }).collect(Collectors.toList());

            }
            return catelog2Vos;

        }));
        String s = JSON.toJSONString(parent_cid);
        redisTemplate.opsForValue().set("catalogJSON",s,1, TimeUnit.DAYS);
        return parent_cid;
    }

    //从数据库查询并封装分类数据
    public Map<String, List<Catelog2Vo>> getCatalogJsonFromDbWithLocalLock() {

        /**
         * 将数据库的多次变为一次
         *
         */
//        本地加锁    springboot单例   锁住当前一个，集群则不行，分布式要用分布式锁
        synchronized (this){
            String catalogJSON = redisTemplate.opsForValue().get("catalogJSON");
            if(!StringUtils.isEmpty(catalogJSON)){
                Map<String,List<Catelog2Vo>> result = JSON.parseObject(catalogJSON,new TypeReference<Map<String, List<Catelog2Vo>>>(){});

                return result;
            }


            List<CategoryEntity> selectList = baseMapper.selectList(null);

            List<CategoryEntity> level1Categorys = getParent_cid(selectList,0L);

            Map<String, List<Catelog2Vo>> parent_cid = level1Categorys.stream().collect(Collectors.toMap(k -> k.getCatId().toString(), v -> {
                List<CategoryEntity> categoryEntities = getParent_cid(selectList,v.getCatId());
                List<Catelog2Vo> catelog2Vos = null;
                if (categoryEntities != null) {
                    catelog2Vos = categoryEntities.stream().map(l2 -> {
                        Catelog2Vo catelog2Vo = new Catelog2Vo(v.getCatId().toString(), null, l2.getCatId().toString(), l2.getName());
                        List<CategoryEntity> level3Catelog =getParent_cid(selectList,l2.getCatId());
                        if(level3Catelog!=null){
                            List<Catelog2Vo.Catelog3Vo> collect = level3Catelog.stream().map(l3 -> {
                                Catelog2Vo.Catelog3Vo catelog3Vo = new Catelog2Vo.Catelog3Vo(l2.getCatId().toString(), l3.getCatId().toString(), l3.getName());
                                return catelog3Vo;

                            }).collect(Collectors.toList());
                            catelog2Vo.setCatalog3List(collect);
                        }
                        return catelog2Vo;
                    }).collect(Collectors.toList());

                }
                return catelog2Vos;

            }));
            String s = JSON.toJSONString(parent_cid);
            redisTemplate.opsForValue().set("catalogJSON",s,1, TimeUnit.DAYS);
            return parent_cid;


        }


    }
    private List<CategoryEntity> getParent_cid(List<CategoryEntity> selectList,Long parent_cid){
        List<CategoryEntity> collect = selectList.stream().filter(item -> item.getParentCid() == parent_cid).collect(Collectors.toList());
        return collect;
    }

}